What absorbs at 730 cm⁻¹ in an FTIR spectrum?
A band near 730 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Hurtigt svar
A band near 730 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Alkyl C-H | 9 | 7 | 1,0 |
| Phosphate (PO4) | 5 | 3 | 1,0 |
| Metal oxygen | 4 | 4 | 1,0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Anhydride | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Perchlorate | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Methacrylate | 1 | 0 | 1,0 |
| Ketone | 1 | 0 | 1,0 |
| Ester | 1 | 0 | 1,0 |
| Carboxyl (COOH) | 1 | 0 | 1,0 |
| Amide | 1 | 0 | 1,0 |
| Acetate | 1 | 0 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| asphalt binder | 730, 1700, 1242 | Alkyl C-H | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 730 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Alkyl C-H tillid 1,0
“and Py with initial mass ratio (i.e., 14, 24, 32, and 40 wt%) The C-H out of plane bending vibration band was observed was added into the solution and mixture was stirred at room at 730 cm-1 for PNPhPy [27].”
Cetiner 等 - 2011 - Characterization of Conductive Poly(Acrylonitrile- DOI: 10.1007/s12221-011-0151-z -
Perchlorate tillid 1,0
“The 4) and EC solution, considerable a lithium perchlorate (LiClO cm-1 gel exhibits predominantly ionic nature and a 0.67 of appear corresponding to the shoulders at 730 and 900 cm-1 lithium ion transference number.”
Electrical and structural studies of a LiBOB-based gel polymer electrolyte DOI: 10.1007/s11581-016-1834-7 -
tillid 1,0
“699cm-1, centhydrocarbonchainsandthesplitismorepronouncedatlower the Due to the strong peak of Si-O-Al bending at 730cm-1 temperature with an orthorhombic subcell [28].”
Li 等 - 2008 - An FTIR investigation of hexadecyltrimethylammoniu DOI: 10.1016/j.saa.2008.05.015 -
Lipid tillid 1,0
“Asphalt binders cm-1, modified with wax-type additives showed peak response at 730 and 1540 which represents a double stretching bond of carbon and a single stretching bond between nitrogen and oxygen.”
Analysis of the Properties of Modified Asphalt Binder by FTIR Method DOI: 10.3390/ma15165743 -
Carbonyl (C=O) tillid 1,0
“The absorption bands at 730 and cm-1 1780 are attributed to carbonyl groups in both imide and anhydride rings.”
Yang 等 - 2016 - Comparison of different methods for determining th DOI: 10.1007/s10118-016-1749-9. -
tillid 1,0
“The band at 730 is attributed to the Zn-O The calculated mesh parameters of the powders are equal to a group, while the two bands, respectively, at 3014.24 and cm-1, = 17.92690 Å, b = 19.26990 Å, and c = 50.45000 Å.”
Adala 等 - 2022 - Two Coordination Polymers Synthesized from Various DOI: 10.1021/acsomega.1c06049 -
Borate tillid 1,0
“The vibrational modes at 1450, 1315, and peak at of the B 3 730cm-1 B-Cl B-O exposure.48 There may also be vibrations are attributed to vibrations as discussed earlier surface after BCl 3 1500cm-1”
Spontaneous etching of B2O3 by HF gas studied using infrared spectroscopy, mass spectrometry, and density functional theory DOI: 10.1116/6.0001542 -
C-S single bond tillid 1,0
“C=O stretching 1724 O-H Overlapping (def.) of C=C ring stretching 1585, 1442 C-O stretching due to phenol 1263 C-H C=C-H (def.) of (o.o.p.) from aromatic rings 800 Weak absorption indicating C-S stretching 730, 710, 678 reported melanins ar”
Purification and characterisation of a sulphur rich melanin from edible mushroom Termitomyces albuminosus Heim DOI: 10.1080/21501203.2018.1494060
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